JPH0537527A - Data transmitter using digital radio network - Google Patents

Abstract

PURPOSE:To attain sure data transmission by using a digital radio network. CONSTITUTION:A master station 1 includes a terminal equipment 10 and a communication adaptor 11 and implements data transmission reception with a slave station 3 via the digital radio network 2 according to a predetermined procedure. The communication adaptor 11 includes a CPU 20 and sends a data from the terminal equipment 10 to the digital radio network 2 according to a program preset in a memory 21 and sends the data from the digital radio network 2 to the data terminal equipment 10. When the terminal equipment 10 starts communication and the communication is finished, a relay 22 is controlled to interrupt the power supply of the CPU 20 tentatively to reset the communication adaptor 11. Thus, while the communication adaptor 11 is not locked, the data is sent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for transmitting data for remote monitoring by a plurality of stations using a digital wireless network called a so-called teleterminal system.

[0002]

2. Description of the Related Art For example, the opening degree of a governor provided in the middle of a gas supply path can be monitored by data transmission using a digital wireless network. Radio waves in a specific frequency band are assigned in advance to the digital radio network, and reliable data transmission can be performed according to a predetermined communication sequence.

FIG. 10 shows a schematic procedure in data transmission through a digital wireless network. In data transmission such as remote monitoring via a digital wireless network, one station serves as a master station and it is necessary to call a plurality of slave stations by polling, or to call the master station when an abnormal situation occurs. There is a method of calling the parent station from the resulting child station. The equipment of each station is provided with a terminal device (hereinafter sometimes abbreviated as “DTE”) and a communication adapter (hereinafter sometimes simply referred to as “TE”), and each DTE is a TE.
Through the two-way communication with a digital wireless network (hereinafter sometimes abbreviated as "TT"). The DTE of the calling station transmits the connection request to the connection confirmation procedure until it receives the connection confirmation, the data transmission procedure until it receives the data, and the disconnection request. Data transmission is performed through the line disconnection procedure from receiving the disconnect response.

[0004]

In a data transmission device using a digital wireless network, detailed procedures are determined in advance so that reliable data transmission can be performed. Therefore, the communication adapter (TE) has a central processing unit (hereinafter abbreviated as “CPU”) independently realized by a microcomputer or the like, and transmits data according to a predetermined program. If the reception of data from the DTE or the reception of data from the digital wireless network (TT) competes with each other at a specific timing, the CPU of the TE becomes locked and cannot operate normally, or the TE and the DTE It is possible that data transmission between and will be locked. In this way, when a locked state occurs between TE or TE and DTE, as shown in FIG.
It becomes impossible to perform data transmission according to the procedure as illustrated.

An object of the present invention is to provide a data transmission device using a digital wireless network which can prevent data transmission from becoming impossible due to a locked state or the like and can perform reliable data transmission. That is.

[0006]

According to the present invention, a plurality of station devices can communicate with each other via a digital wireless network for transmitting and receiving data, and at least one of the plurality of station devices is used.
One is provided between the terminal device that performs data processing and the terminal device and the digital wireless network. Wired communication with the terminal device and wireless communication with the digital wireless network is performed, and when initialized, the operating state is set in advance. The terminal device is a data transmission device using a digital wireless network, characterized in that the terminal device is initialized before or after communication is started.

Further, according to the present invention, a plurality of station devices can communicate with each other for transmitting and receiving data via a digital radio network, and at least one of the plurality of station devices is a terminal that performs data processing. A communication adapter that is provided between the device and the terminal device and the digital wireless network, communicates with the terminal device in a wired manner and wirelessly with the digital wireless network, and transitions to a predetermined operation state when initialized, and a predetermined communication adapter. A data transmission device using a digital wireless network, including a timer for measuring a set time, wherein the terminal device measures the time by the timer and initializes the communication adapter when a predetermined time has elapsed. .

Further, according to the present invention, a plurality of station devices can communicate with each other for transmitting and receiving data via a digital radio network, and at least one of the plurality of station devices is a terminal for performing data processing. A communication adapter that is provided between the device and the terminal device and the digital wireless network, communicates with the terminal device in a wired manner and wirelessly with the digital wireless network, and transitions to a predetermined operation state when initialized, and a predetermined communication adapter. Including a timer for measuring a set time, the terminal device initializes the communication adapter at the start of communication or at the end of communication, performs time measurement by the timer when not in communication, and the communication adapter when the set time has elapsed A data transmission device using a digital wireless network characterized by being initialized.

[0009]

According to the present invention, at least one of the plurality of station devices capable of communicating with each other via the digital wireless network is
It includes a terminal device and a communication adapter. The terminal device initializes the communication adapter before the start of communication or after the end of communication. When the communication adapter is initialized, it shifts to a predetermined operation state. Since the terminal device initializes the communication adapter before communication starts or after communication ends, even if the communication adapter is locked by the time before communication or during communication, it can be returned to the state where communication is possible again. it can.

According to the present invention, at least one of the plurality of wireless station devices capable of mutually transmitting and receiving data via the digital wireless network includes a terminal device, a communication adapter and a timer. The terminal device uses a timer to initialize the communication adapter each time a preset time has elapsed. For example, in the case of receiving a polling call every predetermined time, by setting the timer setting time slightly longer than the polling cycle, even if the communication adapter or other functional failure occurs during the polling call, It is possible to realize reliable data transmission.

Further, according to the present invention, one of the plurality of station devices that mutually transmit and receive data via the digital wireless network includes a terminal device, a communication adapter, and a timer. The terminal device initializes the communication adapter at the start of communication or at the end of communication, and when communication is not performed, initializes the communication adapter every time the time set in the timer elapses. As a result, the wireless station device can be reliably returned to the state in which it performs the function for data transmission.

[0012]

1 is a block diagram showing the electrical construction of an embodiment of the present invention. The master station 1 performs data transmission with the plurality of slave stations 3 via the digital wireless network 2 for remote monitoring by the polling method. Master station 1 and digital wireless network 2
It is possible to communicate with 800MHz band radio waves between
The digital wireless network 2 and the slave station 3 can also communicate with each other by radio waves in the 800 MHz band.

The master station 1 has a terminal device (DTE) 10 and
A communication adapter (TE) 11, an antenna 12, and a power supply 13 are included. The terminal device 10 and the communication adapter 11 are connected by a wire by a transmission line 14 that complies with the RS-232C standard by the Electronic Industries Association of America (abbreviation "EIA"). The power supply 13 supplies power to the terminal device 10 and the communication adapter 11. The power supply 13 converts electric power from a commercial AC power supply (AC100V) into DC and supplies the DC. The power source 13 is also backed up by a battery, and power is supplied from the battery in the event of a power failure.

The terminal device 10 includes a CPU 15,
It operates according to a program stored in the memory 16 in advance. A timer 17 is connected to the CPU 15 and CP
When the time set by U15 is counted, a signal is given to the CPU 15. CPU15 and RS-232C transmission line 14
An RS-232C driver 18 is provided between and.

The communication adapter 11 is provided with a CPU 20 and converts data between the terminal device 10 and the digital wireless network 2 in accordance with a program stored in advance in the memory 21. The power of the CPU 20 is supplied from the power source 13 via the relay 22. The CPU 20 is initialized so as to shift from a power-off state to a state in which data conversion is possible according to a procedure preset in the memory 21 when power is applied. The CPU 20 has
A transmission / reception circuit 23 is connected and communicates with the digital wireless network 2 via the antenna 12. An RS-232C driver 24 is provided for connection with the RS-232C transmission line that connects between the CPU 20 and the terminal device 10.
The relay 22 is OFF / ON controlled by a signal from the CPU 15 via the line 25.

The slave station 3 also includes the terminal device 30 and the communication adapter 3.
1, the antenna 32, and the power supply 33, and has the same configuration as the master station 1.

FIG. 2 is a flow chart showing the operation of the master station 1 shown in FIG. 1 according to an embodiment of the present invention. The operation is started in step a1, and the timer 17 measures the time for polling in step a2, and waits until the time elapses. At step a3, the communication adapter (TE) is reset, that is, initialized. In step a4, one slave station 3
Establish a line to. In step a5, data transmission / reception with one slave station 3 is performed. At step a6, a disconnection request signal is transmitted to the digital wireless network 2. In step a7, the digital wireless network 2 waits for a disconnect response. Next, in step a8, reset the communication adapter,
The process ends at step a9. When polling a plurality of slave stations 3, steps a4 to a7 may be repeated.

FIG. 3 is a flow chart showing the operation when the slave station 3 responds to the polling from the master station 1. The operation is started from step b1, and in step b2, in response to the call from the master station 1, it waits for an incoming call instruction given from the digital wireless network 2 to be received. When the incoming call instruction is received, an incoming call response is transmitted in step b3. Next, in step b4, data is transmitted and received, and in step b5, it waits until the disconnection instruction from the digital wireless network 2 is received. After receiving the disconnection instruction, the communication adapter (TE) is reset in step b6, and the process ends in step b7.

FIG. 4 is a flow chart showing the operation when the slave station 3 detects an abnormality and urgently transmits data to the master station 1. Slave station 3 that started operation in step c1
Waits until emergency call data is generated in step c2. When data is generated, in step c3 the communication adapter (TE)
To reset. Next, in step c4, the line is established, data is transmitted in step c5, a disconnection request signal is transmitted in step c6, and in step c7, a disconnection response signal is waited. The communication adapter is reset in step c8, and the process ends in step c9.

In each operation shown in FIGS. 2 and 4,
Although the communication adapter is reset before the start of communication or after the end of communication, it may be reset by only one of them.

FIG. 5 shows a master station 1 according to another embodiment of the present invention.
3 is a flowchart showing the operation of FIG. In this embodiment, the timer 17 shown in FIG. 1 has T, T1, T2, T3, T
5 user timers of 4 are included. The operation is started at step d1 and the timer T1 is reset at step d2. In step d3, the timer T1 is counted up, and in step d4, it is determined whether or not the timer T1 has timed out.
If the time-out has not occurred, it is determined in step d5 whether or not there is polling. If polling is present, the communication adapter 11 is reset at step d6, and polling for calling the n-th slave station is started at step d7. Note that FIG. 5 forms one flowchart together with FIGS. 6, 7, and 8, and the drawings are mutually connected by ,,, and.

When the T1 time-out occurs in step d4, it is determined in step d8 whether communication is in progress.
When communication is not in progress, the communication adapter 11 is reset in step d9 and the process returns to step d2. When communicating,
The timer T1 is reset at step d10, and the process proceeds to step d5.

Turning to FIG. 6, at step d11, the timer T2 starts the time counting operation. At step d12, a connection request signal is transmitted to the digital wireless network 2. In step d13, it is determined whether or not a connection confirmation signal is received from the digital wireless network 2. When it is received, the session is established in step d14. Next, in step d15, the timer T2 is reset, and in step d
The procedure for line connection from 11 is terminated.

Next, at step d16, the time counting by the timer T3 is started. At step d17, the data request signal is transmitted. Next, in step d18 of FIG.
It is determined whether or not data has been received from the digital wireless network 2. When the data is received, the timer T3 is reset in step d19, and the procedure of data transmission / reception from step d16 is completed.

Next, at step d20, the timer T4 starts the time counting operation, and at step d21 a disconnection request signal is transmitted. In step d22, it is determined whether or not a disconnection response signal from the digital wireless network 2 has been received. When received, the timer T4 is reset in step d23, the session is released in step d24, and the line disconnection procedure from step d20 ends.

At step d25, it is judged whether or not the polling is completed. If it is not completed, a call is made to the next (n + 1) th slave station 3 at step d26, and the process returns to step d11. When polling ends in step d25, the process returns to step d3 in FIG.

When no signal is received from the digital radio network 2 in steps d13, d18 and d22, steps d27 to d3 are respectively performed.
2, step d33 to step d38, step d39
-The operation of step d44 is performed. In these operations, when the timers T2, T3 and T4 are timed out or a failure is notified from the digital wireless network 2, the call to the child station 3 is terminated and the call to the next child station is started.

FIG. 9 is a part of a flow chart showing the operation of the master station 1 in still another embodiment of the present invention. This embodiment is similar to the embodiment shown in FIGS.
The parts corresponding to are given the same reference numerals. The operation corresponding to FIG. 8 is shown in FIG. Note that step d25
When the polling is completed in, the timer T1 is reset in the next step d45 and then the process returns to step d3 in FIG.

Although the embodiments shown in FIGS. 5 to 9 show the case of the master station 1, it goes without saying that the slave station 3 may be similarly implemented.

[0030]

As described above, according to the present invention, since the terminal device initializes the communication adapter at the start of communication or after the end of communication, a lock state or the like occurs between the communication adapter or the communication adapter and the terminal device. Even when the situation occurs, the locked state can be released and reliable communication can be performed.

Further, according to the present invention, since the terminal device initializes the terminal device when the time set in the timer elapses, it is possible to reliably perform data transmission when data is transmitted and received at a predetermined polling cycle. It can be carried out.

According to the present invention, the terminal device initializes the terminal device before the start of communication or at the end of communication, and when the communication is not in progress, initializes the communication adapter after the time preset in the timer has elapsed. . As a result, reliable data transmission can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 4 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 5 is a flowchart showing the operation of another embodiment of the present invention.

FIG. 6 is a flowchart showing the operation of another embodiment of the present invention.

FIG. 7 is a flowchart showing the operation of another embodiment of the present invention.

FIG. 8 is a flowchart showing the operation of another embodiment of the present invention.

FIG. 9 is a flow chart showing the operation of still another embodiment of the present invention.

FIG. 10 is a diagram showing a procedure of data transmission via a digital wireless network.

[Explanation of symbols]

1 parent station 2 Digital wireless network 3 slave stations 10.30 Terminal device 11,31 Communication adapter 12,32 antenna 13,33 power supply 14,34 RS-232C transmission line 15, 20, 35, 40 CPU 17,37 timer 18,24,38,44 RS-232C driver 22,42 relay 23,43 Transmitter / receiver circuit

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ichiro Sugimoto             4-1-2 Hirano-cho, Chuo-ku, Osaka City, Osaka             Gas Co., Ltd. (72) Inventor Mitsutoshi Yamada             4-3-1 Tsunashima-Higashi, Kohoku-ku, Yokohama-shi, Kanagawa             Matsushita Communication Industry Co., Ltd. (72) Inventor Jun Kanda             4-3-1 Tsunashima-Higashi, Kohoku-ku, Yokohama-shi, Kanagawa             Matsushita Communication Industry Co., Ltd.

Claims (3)

[Claims] 1. A plurality of station devices can communicate with each other for transmitting and receiving data via a digital wireless network, and at least one of the plurality of station devices is a terminal device that performs data processing, and a terminal device. The communication device is provided between the device and the digital wireless network, includes a communication adapter that performs wired communication with the terminal device and wireless communication with the digital wireless network, and shifts to a predetermined operation state when initialized, wherein the terminal device is A data transmission device using a digital wireless network, wherein the communication adapter is initialized before communication is started or after communication is ended. 2. A plurality of station devices can communicate with each other for transmitting and receiving data via a digital wireless network, and at least one of the plurality of station devices is a terminal device that performs data processing, A communication adapter, which is provided between the terminal device and the digital wireless network, performs wired communication with the terminal device, wirelessly communicates with the digital wireless network, and shifts to a predetermined operating state when initialized, and a predetermined set time. A data transmission device using a digital wireless network, comprising: a timer for measuring time, wherein the terminal device measures time by the timer and initializes the communication adapter after a lapse of a predetermined time. 3. A plurality of station devices can communicate with each other for transmitting and receiving data via a digital wireless network, and at least one of the plurality of station devices is a terminal device that performs data processing, A communication adapter, which is provided between the terminal device and the digital wireless network, performs wired communication with the terminal device, wirelessly communicates with the digital wireless network, and shifts to a predetermined operating state when initialized, and a predetermined set time. A timer for counting time, the terminal device initializes the communication adapter at the start of communication or at the end of communication, performs time measurement by the timer if not in communication, and initializes the communication adapter when a set time has elapsed A data transmission device using a digital wireless network characterized by the above.